Avoid parts by TRQ, mostly Chinese stuff.

A seized RR brake can be caused by:

1. Seized caliper (but you installed a new caliper).

2. Internal swelling of brake hose. If you want to remove the brake hose, consider some heat.
This was discussed in P80 forum at length.

3. Stuck valve inside the ABS hydraulic module. Try to bleed it again.

Wait...the base model came from factory with no rear swaybar?

Fcpeuro lists sway bar and endlinks for your year.
Maybe the previous owner removed it?

Likely broken rad neck, common problem in old car.
Just tow it home.
Search FCPEuro for rad review.
When in doubt, use Volvo genuine part.
Time to replace both hoses too.

I wrote info on that blend door arm linkage for my 2005 XC90 in the forum.

Most of the VIDA codes are not that important.
I use a regular code reader, if no CEL codes, I am fine.

Also, the key thing with Outer c-clip during reinstallation...
- Tap the CV joint stud with rubber hammer until it touches the c-clip.
- Then gently "tuck" the c-clip underneath while hammering a bit more. If you have 2nd person, it is better but I have done this by myself for years.
- Then try to ...

Is this what you referred to?

https://www.fcpeuro.com/products/volvo- ... ng-1377060

If you did a little homework first, then you would not have bought Autolite plugs. We already talked about it years ago.

Bosch or NGK is fine. I have been using both brands.

Currently, NGK Iridium is what I use.